The essentially similar thread at
https://www.msofficeforums.com/word-vba/22557-how-copy-userform-text-formfield-contents-outlook.html shows how to access the body of an e-mail message, whereupon it can be processed in VBA just like a Word document, within the limitations of what you can have in an Outlook message.
The macro in the thread is a Word macro. It is equally possible to process from Outlook in much the same way, declaring a Word app rather than an Outlook one.
The other thread pastes the whole document, you could equally paste selections or transfer ranges, just like transferring between Word documents.